@misc{Keffermüller_Maria_(_–2011)_Badania_1959,
 author={Keffermüller, Maria ( –2011)},
 editor={Skuratowicz, Wacław (1915–1989). Promotor},
 copyright={Rights Reserved - Restricted Access},
 address={Poznań},
 howpublished={online},
 year={1959},
 title={Badania nad fauną jętek (Ephemeroptera) Wielkopolski},
 keywords={shadflies, ecology, mayflies, identification, Poland, identification key, Ephemeroptera},
}